堅ㄐㄧㄢjiān如ㄖㄨˊrú磐ㄆㄢˊpán石ㄕˊshí

  1. 像磐石一樣堅固。比喻極為堅定，不可動搖。如：「同胞們血濃於水的感情，堅如磐石。」似牢不可破、固若金湯、堅不可摧、安如磐石、穩如泰山反不堪一擊、一觸即潰

英solid as a boulder (idiom)​; absolutely secure, rock-firm and unyielding